Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720e99426a52b0a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 06:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 674861d7ad518f4abb31235480157854 SHA-1: 901b1418e05004fa4b4ca4b950c3fe38d9caab45 SHA-256: 4720e99426a52b0ac3d62e7e33e3efb2858b2e7a9d0db2001384cbb22b8bc189
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=quality+management+system+example+pdf PDF link annotation
    • http://tufofol.medianewsonline.com/21721324129.pdfIn PDF document text
    • https://milajibejo.weebly.com/uploads/1/3/1/8/131871424/disuf-lobaji.pdfIn PDF document text
    • https://jajajijonox.weebly.com/uploads/1/3/1/4/131453539/402feef5b905552.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/labuf-namuxed-tijiroxupadabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6058dfab7c244.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/rovawibeve.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/9f136a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467322/normal_5fed72751b40f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bb1403-9372-4acc-8a80-2cecb242d5b0/98973542630.pdfIn PDF document text
    • http://sideganojasa.epizy.com/larokobatude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac2e814-4e6e-4748-9c1c-ca05ac23a7a2/nordictrack_exp_1000_xi_treadmill_troubleshooting.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_3bbbc0c2a52249a882838185a7c3d470.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9bf380-ba6f-4256-98b9-8ae9f9ed0e03/surah_mulk_benefits_in_islam.pdfIn PDF document text
    • http://suboxasolu.rf.gd/89028030314.pdfIn PDF document text
    • http://vumopigaw.epizy.com/ark_survival_evolved_android_mod.pdfIn PDF document text
    • http://vatasinunevuto.epizy.com/m._d._u_university_date_sheet.pdfIn PDF document text
    • http://jelenaw.myartsonline.com/ways_of_the_world_3rd_edition_chapter_5.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_cd411746443f4753ac6eb20e2bd14d87.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_01c656cecba64b3fb88d490d4dd86507.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_098f72384a6d4792904e5df7a0297e2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb5e6e2-3410-41d5-925e-954b663cab2e/is_the_focusrite_scarlett_a_preamp.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 5496 bytes
SHA-256: cb94eb6c2912f1a6d2292a31de661f9c6e4ecb199f5205aa125ca21aa4995662
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 9952 bytes
SHA-256: a65c3cb500fda571bd7a2863cec8dae37e13bd0824a3186f7497313af006dba8